Tilting furnace.



No. 802,151. PATENTED 0OT.17,1905. P. H. TREAT. TILTING FURNACE.

APPLIOATION FILED NOV. 25, 1903.

3 SHEETS-SHEET 1.

WITNESSES INVENTOWM/ WW. I. Mull 2a., mmmulmlmfls, WANNA n c.

- open-hearth steel furnaces.

UNITED STATES PATENT FFIQE.

TILTING FURNACE.

Specification of Letters Patent.

Patented Oct. 1'7, 1905.

Application filed November 25, 1908. Serial No. 182,674.

T0 (1, whom, it may concern:

Be it known that I, FRANoIs H. TREAT, of Pittsburg, Allegheny county,Pennsylvania, have invented a new and useful Tilting Fur nace, of whichthe following is a full, clear, and exact description, reference beinghad to the accompanying drawings, forming part of this specification, inwhich- Figure 1 is a vertical cross-section of my improved furnace. Fig.2 is a partial side elevation, partly broken away. Fig. 3 is a plan Viewof the rocking mechanism; and Fig. 4 is a side elevation, partly brokenaway, of the rocker and rocking mechanism.

My invention relates to the class of tilting furnaces, and moreparticularly to tilting Heretofore furnaces of this tilting type havebeen supported upon rollers which rest upon curved tracks. With thisconstruction it is difficult to obtain an even support for the furnace,especially under the expansion and contraction thereof when subjected toheat. Such constructions are. moreover, difficult and expensive to buildand to maintain and are structurally poorly adapted for large furnaces.

My invention is designed to provide simple and effective apparatus forsupporting, carrying, and tilting furnaces of this type.

In the drawings, 2 represents the furnace proper, which is carried ontransverse frames resting on two longitudinal box-girders 3 3. Thetransverse frames preferably contain oppositely-inclined girders 4: 4:,which are tied together at their inner ends in pairs by gusset plates orgirders 5.

The outer ends of the inclined beams 4c are secured to the verticalbuck-stays or columns 6 6, which are tied together across the top of thefurnace by beams 7 Short separators 8 8 are preferably used between theinclined beams 1 along each side. The transverse beams constituteseparate frames like the ribs of a vessel and the furnace-plates aresecured to them.

Each transverse frame is preferably secured to the longitudinalbox-girder 3 by lips 9 9, which allow a slight movement of the framelongitudinally of the girders to permit expansion and contraction underheat. Each boxgirder 3 is of sufficient strength to carry the girders 3are preferably of fish-belly form, as shown in Fig. 2, and theselongitudinal girders rest upon rockers located under their end portions.Each rocker is made up of a pair of curved girders 10 10, each girderpreferably consisting of a steel casting of the form shown in Fig. 1,the intermediate lower portion of the casting being preferablyrecessed,as shown in Fig. 2, to receive the rail or support 11 11. Theserails 11 form the upper bearing portions of longitudinally-movable bedsor supports 12, which are of box-girder form and rest upon rollers 13.The rollers 13 move upon stationary tracks 14, forming part of thefoundation. The rollers are arranged in pairs and mounted upontransverse shafts 15, and each roller-shaft extends through alongitudinal casting 16, which ties the set of rollers together.

The intermediate rollers 13 of the set are slightly smaller in diameterthan the rollers near the ends of the set to distribute the load andcompensate for the deflection of the girder by reason of the heavy loadthereon.

Each of the steel castings forming the rockers bears uponoppositely-located rollers 17 mounted in stationary bearings upon tracks18. These rollers 17 are, however, only guiderollers and do not carryany substantial portion of the load. They serve to compel the rocking orturning of the furnace when the longitudinal bed is moved endwise.

I have shown the longitudinal beds or supports 12 as actuating therockers by means of racks 19, carried on the beds between the rails 11and engaging segmental racks 20, lo-

cated between the castings of each rocker and shown in Figs. 2 and 4.The beds or supports 12 are moved endwise by means of any suitablemechanism, and for this purpose I have shown each hollow box-girdermember 12 as provided with an intermediate inner nut 21, which iscarried upon trunnions 22,

-mounted in the sides of the girder. Through this trunnion-nut extends ascrew 23, secured to a shaft 24:, extending through a thrustbearing 25and actuated by slow-motion gearing 26 from an electric motor 27,mounted upon the end portion of the cantaliver-beam 28, forming anextension of the bed 12. The screw turns within a closed casingconsisting of pipe-sections or hollow castings 29 and 30, whose innerends are screwed into the end of the nut. The section 30 is providedwith a stuffing-box 31, through which the shaft 24 extends, while theend of the section 29 is closed. This casing is filled with oil whichlubricates the screw and nut.

In operating the furnace the electric motors are actuated to turn thescrews in either direction desired, and these screws acting through thenuts will move the beds or supports 12 endwise, and thus actuate therockers through their rack connections. As the beds move endwisetheguide-rollers 17 compel the furnace to rock or roll upon its axis.

The advantages of my invention result from supporting the tiltingfurnace upon longitudinally-moving beds, also from the longi tudinallymoving beds in connection with means for holding the furnace in positionand causing it to turn as the supports are moved endwise. A simple andefficient structure is thus obtained. The frame arrangement for thefurnace distributes the load over the longitudinal girders whichtransmit it to. the rockers. The arrangement forcausing endwise movementof the rockers is inclosed and not liable to get out of order while easyaccess may be had to the various parts.

The turning of the furnace may be secured by link mechanism or otherdevice than the guide-rollers shown, the means for moving the supportsendwise may be varied, and the structure of the furnace and actuatingmechanism for moving it may be changed Without departing from myinvention.

1 claim 1. A tilting furnace supported upon beds, and mechanism formoving said beds endwise in a plane at an angle to the plane of rotationof the furnace; substantially as described.

2. A tilting furnace carried upon longitudinal-movable beds, means formoving the beds in planes at an angle to the plane of rotation of thefurnace and mechanism for holding the furnace in position and causing itto turn as the beds are moved longitudinally; substan tially asdescribed.

3. A tilting furnace carried upon endwisemovable beds, means for movingthe beds in planes at an angle to the plane of rotation of the furnaceand guiding-rollers arranged to cause turning of the furnace when thebeds are moved longitudinally; substantially as described.

4. A tilting furnace supported upon curved end rockers, said curvedrockers being carried on endwise-movable beds, and mechanism for movingthe beds longitudinally; substantially as described.

5. A tilting furnace carried upon curved end rockers, endwise-movablebeds supporting the rockers, and guide-rollers engaging the rockers tocause tilting of the furnace; substantially as described.

6. A tilting furnace carried upon endwisemovable beams or supports, andhorizontal sets of rollers upon which said beams rest; substantially asdescribed.

7. A tilting furnace having end rockers supported upon endwise-movablebeams means for moving the beams at an angle to the plane of rotationand gear connections between the rockers and beams; substantially asdescribed.

8. A tilting furnace having supporting end rockers, longitudinal beamsextending over the rockers and between them and the furnace structure,and transverse surrounding frames for the furnace secured on thelongitudinal beams or girders; substantially as described.

9. A tilting furnace having supporting end rockers, longitudinal beamsextending over the rockers and between them and the furnace structure,and transverse surrounding frames for the furnace secured on thelongitudinal beams or girders, each surrounding frame having loweroppositely-inclined beams between the furnace and the longitudinalbeams; substantially as described.

10. A tilting furnace having oppositely-inclined transverse beamsbeneath it and longitudinal girders supporting said beams and having asliding clip connection therewith; substantially as described.

11. A tilting furnace having transverse frames supported uponlongitudinal girders, curved rockers upon which the longitudinal girdersare carried, flat beds supporting the curved rockers, and means fortilting the furnace and bringing the curved rockers to a differentposition relative to the flat beds; substantially as described.

12. A tilting furnace supported upon longitudinal girders, end rockersupon which the girders rest, endwise movable beds upon which, therockers are supported, and mechanism for moving the beds endwise;substantially as described.

13. A tilting furnace having tilting mechanism comprising a curvedrocker having toothed connection with a rack, screw-gear arranged tomove the rack endwise and an endwise-movable bed on which the rocker issupported; substantially as described.

14, A tilting furnace having end rockers, racks having toothedengagement with said rockers and screw-gear arranged to connect theracks; substantially as described.

15. A tilting furnace having rockers carried upon hollow box-girders andscrew mechanism inclosed within the box-girders and arranged to movethem endwise; substantially as described.

16. Atiltingfurnacehavingacurved rocker carried upon an endwise-movablebed having a trunnioned nut, a screw engaging said nut and means forrotating the screw; substantially as described.

17. A tilting furnace carried upon endwisemovable box-girders, nutstrunnioned Within which the girders rest and screw mechanism 10 thebox-girders, screws engaging the nuts, an Within the girders arranged tomove them inclosed casing for the screws, said screws endWise;substantially as described. having projecting stems and mechanism for Intestimony whereof I have hereunto set 5 rotating said stems;substantially as demyhand.

scribed. FRANCIS H. TREAT.

18. A tilting furnace having curved end Witnesses: rockers supportedupon endwise-movable hol- H. M. GORWIN,

low girders, horizontal sets of rollers upon JOHN MILLER.

